While 308W may not be the present favourite calibre for Hunter Class, it is close to the mark, it used to be very popular, and can be used successfully. Its only drawback being the amount of recoil over a full match of 50 plus rounds.

Your only other problem would appear to be the weight limit of 6.35kg with your particular rifle.

It has been done not so long ago and was downloaded somewhat useing 110 grain projectiles if its accuate cant see a problem.
Take the Bi-Pod off and make sure it dosent go over 6.35Kg and will be fine.

G'Day all,
from memory, doesn't hunter class require a magazine feed for a minium of 2 rounds and isn't the Omark a single shot action? If so it cant be legal for hunter class can it?
Just trying to ensure no one gets messed around............
Cheerio Geoff